<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>2.22</title>
</head>
<body>
    <script>
        function move({x = 0,y = 0} = {}){
            return [x,y];
        }
        console.log(move({x:3,y:8}));   //[3,8]
        console.log(move({x:3}));   //[3,0]
        console.log(move({}));   //[0,0]
        console.log(move());   //[0,0]
    </script>
</body>
</html>